C-25 PS Copper Foil / Polyester Film EMI-RFI Shielding Tape (Solderable)
C-25 PS is a heavy-duty copper foil and polyester film laminate pressure-sensitive tape whose copper shield is solderable when done with care, combining a 0.0014″ copper foil, 0.00092″ polyester film, and 0.001″ acrylic adhesive for a total thickness of 0.0043″. It delivers signal attenuation of 115 dB @ 100 MHz, peel strength of 32 oz/inch of width, and dielectric strength of 5,000 volts. Tensile strength of 23,000 PSI with 29% elongation at break gives the tape both structural durability and conformability during application.
Key Properties
- Peel Strength: 32 oz/inch of width (ASTM-D-1000)
- Signal Attenuation: 115dB @ 100 MHz (ASTM D4935-99)
- Tensile Strength: 23,000 PSI (ASTM-D-882)
- Dielectric Strength: 5,000 volts (ASTM D149)
- Total Thickness: 0.0043″ (PSTC-33)
- Elongation at Break: 29% (ASTM-D-882)
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- Specifications
- Applications
- General Info
- FAQs
Physical Properties
| Property | Value | Test Method |
| Copper Foil Thickness | 0.0014″ | — |
| Polyester Film Thickness | 0.00092″ | — |
| Adhesive Thickness | 0.001″ | — |
| Release Liner | 90# | — |
| Total Thickness | 0.0043″ | PSTC-33 |
| Color | Copper | — |
| Weight/Square Yard | 10 oz./sq yd. | — |
| Yield | 1.6 sq yds/lb | — |
| Shelf Life | 1 year @ 70°F(21°C)/50% R.H. | — |
Mechanical Properties
| Property | Value | Test Method |
| Peel Strength | 32 oz/inch of width | ASTM-D-1000 |
| Tensile Strength | 23,000 PSI | ASTM-D-882 |
| Elongation at Break | 29% | ASTM-D-882 |
Electrical Properties
| Property | Value | Test Method |
| Signal Attenuation | 115dB @ 100 MHz | ASTM D4935-99 |
| Dielectric Strength | 5,000 volts | ASTM D149 |
- Shielding electronic enclosures against EMI/RFI interference
- Maintaining shielding continuity across cable and connector assemblies
- Forming solderable shielding connections for fabricated ground points
- Protecting PCB and component assemblies from electromagnetic interference
- Providing high-attenuation shielding for sensitive electronic devices
Common industries: Electronics manufacturing, telecommunications, aerospace and defense electronics, PCB assembly and fabrication, industrial controls.
C-25 PS is a heavy-duty laminate combining a 0.0014″ copper foil with a 0.00092″ polyester film carrier and a 0.001″ acrylic pressure-sensitive adhesive, engineered for demanding EMI and RFI shielding applications where both durability and moderate flexibility are required. The copper foil provides the shielding path, the polyester film adds mechanical reinforcement, and the acrylic adhesive delivers a lasting bond to substrate surfaces.
Notably, the copper shield on this grade can be soldered directly if done with care, supporting fabricated ground connections in addition to the pressure-sensitive bond. The tape is supplied with a 90# release liner in a copper finish, weighs 10 oz./sq yd. (yielding 1.6 sq yds/lb), and carries a shelf life of one year when stored at 70°F (21°C) and 50% relative humidity.
What differentiates C-25 PS from other tape grades in the line?
C-25 PS pairs solderable copper shielding with a balanced mechanical profile — 23,000 PSI tensile strength and 29% elongation at break — giving it more conformability than thinner solderable grades like C-20 PS while still delivering 115 dB of attenuation at 100 MHz and a higher 5,000-volt dielectric rating.
Why is peel adhesion important for C-25 PS?
C-25 PS carries a 32 oz/inch of width peel rating (ASTM-D-1000). Since the copper surface may also be soldered for a ground connection, dependable adhesion keeps the tape firmly seated and in continuous electrical contact with the substrate throughout installation and any subsequent soldering.
What is the storage range for C-25 PS?
The TDS specifies a shelf life of 1 year when stored at 70°F (21°C) and 50% relative humidity.
Is C-25 PS suitable for FCC-regulated EMI/RFI shielding environments?
No compliance standard is specified on the manufacturer's TDS for C-25 PS. Measured attenuation performance (115 dB @ 100 MHz per ASTM D4935-99) is provided, but suitability for a specific FCC-regulated application should be confirmed against the relevant project requirements.
How should C-25 PS be specified?
Specify grade (C-25 PS), thickness, color, adhesive type, liner type, compliance requirements, dimensional tolerances, and finished format.
